山区高低墩梁式桥墩顶水平位移分析

Analysis of Horizontal Displacement at Pier Top of Girder Bridge with High and Low Piers in Mountainous Area

墩顶水平位移是评价山区高墩桥梁结构受力性能的一个重要指标。依托某山区高速公路工程,对高低墩预制装配式T梁桥的墩顶水平位移进行了分析研究。选取了6种考虑不同墩高参数的高低墩组合形式,分别建立了实体板式和格构式高墩连续T梁全桥有限元模型,对两种墩型结构在汽车荷载制动力、温度荷载和风荷载等作用下的墩顶水平位移进行了计算,通过对比分析找出墩型、墩高、桥墩布置方式等设计参数的变化对高墩结构墩顶水平位移的影响规律,可为类似山区高墩桥梁的设计优化及工程应用提供参考。

Horizontal displacement at pier top is an important evaluation index for the mechanical performance of bridge structures with high piers in mountainous area. Based on a highway project in mountainous area,this paper studies and analyses the horizontal displacement at pier top of prefabricated T girder bridges with high and low piers. 6 kinds of high and low pier combination forms considering different pier height parameters are selected,and the finite element models of continuous T girder bridges with solid plate and lattice high piers are established,respectively. The horizontal displacements at pier top of these bridges under vehicle braking force,temperature,and wind effect are calculated. Besides,the influence of design parameters( including type,height,arrangement mode and order of piers) on the horizontal displacement at pier top of structures with high piers are studied,which can provide guidance for the optimization design and practical application of similar bridges with high piers in mountainous area.